title: [Contrast media enhanced magnetic resonance angiography for determining patency of a coronary bypass. A comparison with coronary angiography].
abstract: OBJECTIVE
  Assessment of graft patency with current non-invasive MRA techniques is particularly difficult for evaluating internal mammary artery grafts. Our aim is to determine the accuracy of a contrast enhanced MRA technique is assessing graft patency.
  
  
  METHODS
  We examined 19 patients with a total of 53 grafts (32 venous/21 arterial), using an ultrafast contrast enhanced 3D gradient-echo technique and compared this with the results of selective angiography.
  
  
  RESULTS
  Sensitivity of the contrast enhanced method was 95.2% for venous grafts, 94.4% for IMA grafts and 94.8% overall. Specificity was 85.7% overall, 90.9% for venous and 66.7% for IMA grafts. Positive predictive value was 94.4%.
  
  
  CONCLUSIONS
  Compared with previous studies, visualisation of IMA grafts was improved by using contrast enhanced MRA. In this preliminary study, contrast enhanced MRA proved promising for the assessment of graft patency.
authors.affiliation: Institut für Radiologische Diagnostik, Klinikum Grosshadern, Ludwig-Maximilians-Universität München. wintersperger@ikra.med.uni-muenchen.de
authors.forename: B J
authors.initials: BJ
authors.lastname: Wintersperger
authors.forename: A
authors.initials: A
authors.lastname: von Smekal
authors.forename: M G
authors.initials: MG
authors.lastname: Engelmann
authors.forename: A
authors.initials: A
authors.lastname: Knez
authors.forename: H V
authors.initials: HV
authors.lastname: Penzkofer
authors.forename: G
authors.initials: G
authors.lastname: Laub
authors.forename: M
authors.initials: M
authors.lastname: Reiser
mesh_terms: D000328:Adult; D000368:Aged; D003287:Contrast Media; D017023:Coronary Angiography; D001026:Coronary Artery Bypass; D005069:Evaluation Studies as Topic; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007089:Image Enhancement; D007387:Internal Mammary-Coronary Artery Anastomosis; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA
vernacular_title: Kontrastmittelverstärkte Magnetresonanzangiographie zur Uberprüfung der Durchgängigkeit koronarer Bypasses. Vergleich zur Koronarangiographie.